Stencil-duplicating machine



April 17, 192s.

1,666,193 E; J. BRASSEUR STENGIL DULICATING MACHINE Filed Oct. 8. 192575heets-Sheet 1 'ATroRNEY Apri11-7, 192s.

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` Api-i117, 192s.`

1,666,193 E. J. BRASSEUR I sTENcIL DUPLICATING MACHINE Filed oct. s.1925 7 sheets-sheet 4` April' 17, 192s. Lamm E. J. BRASSEUR v STENCILDUPLICATING MACHINE Filed Oct. 8. 1925 7 Sheets-Sheet 5 ATTORNEY LammAmin i7, 1928.'

E. J. BRAssEUR- STENCIL DUPLICATING MACHINE [NVEN'I'OR ATTORNEYSheets-Sheet 7 Patented Apr. 1,7, 1928.

irs i' ERNEST J. BRASSEUR, OF CHICAGO, ILLINOIS, ASSIGNOR TO A. B. PICKCOMPANY, OF CHICAGO,l ILLINOIS, A CORPORATION OF ILLINOIS.

STENCILgDUPLICATING M'ACHINE.

Application filed October 8, 1925. Serial No. 61,172.

This invention relates to stencil -dupli'cating mi chines, andv moreparticularly to rotary s1 encil duplicating machines, wherein a sheet ofpaper fed into the machine is frictionally engaged between the rotatablecylinder and a free rubber roller so as to be drawn through the machineupon the rotation of the cylinder, and to receive the inipression fromthe -stencil sheet on the cylinder. The stencil sheet is supplied withprinting ink from the interior of the cylinder, wherein is disposed anink chamber or reservoir. Inone forni ot' construction there -is a.sealed 'ink chamber Within the cylinder Vfrom which ink may permeatethrough a diaphragm on the cylinder to an ink pad covering thediaphragm, and thence to the stencil sheet which is laid over the pad;and there is withinthe ink chamber a tiltable ink trough from which theoperator may spill ink to replenish the stencil sheet. The rubber rollerpresses each paper sheet to be printed upwardly against the inked,rotating stencil sheet to cause the stencil sheet to imprint animpression on the upper sur -face of the paper. vVery often, however,the

cylinder is rotated -withoutI a sheet being interposed between thecylinder and the rubber roller, and if during such rotation the rubberroller should contact the 'inked stencil sheet on the cylinder, thisroller would receive in k thercfrom,witli the result that the machinecould not be used until this ink has been completel cleaned from theroller.

- Otherwise `paper s eets subsequently passed between the cylinder androller would receive ink on ytheir-backs from the rubber roller, and thesheets would be spoiled.

One of the principal objects of-this invention is to provide in a rotarystencil du- .l plicating .machine mechanism which lposifill A .furtherobject of this invention'is to provide improved means for obtainingproper and exact registration between the stencil sheet and each sheetof paper to be printed, so that the imprint from the stencil will beexactly in the desired location and alignment on each sheet.

'Another object -of this invention is to provide improved means forlocating the cylinder transversely on the machine, and for preventingend play thereof.

A further object of this invention is to provide a rotary stencilduplicating machine having a readily removable cylinder and a readilyremovable rubber roller, and toiprovide simple, compact and,durablemeans for removably securing\the members in the ma-k chine assembly. t

A further object ot this invention is to provide improved means forattaching the inking pad and stencil sheet to the machine, which meanspermit the pad to be reversed endwise; which clamp the stencil sheet tothe cylinder in such a way as tol relieve the strain of the stencilsheet stub against the 'hooks therefor; and which prevent ink fromlgoing beyond the ends of the fabric ofthe lnl'r pad and stencil: andanother object of this invention is to'provide Ymeans of this characterwhich are simple, compact, and durable, and which are readily and easilyadjustable on and .removable from the machine to permit replacement of astencil sheet` and in king pad.

Another' object of this invention is to provide improved means forlocking the ink trough against. accidental tipping, but permitting theoperator to tip the trough at will without inconvenience.

Another object of this invention is to provide an improved table forsheets to be fed intothe machine: and to provide a table which iscollapsible to render the machine more compact for storage or fortransportation; and to provide improved paper guideI and registrationmeans onl the table.

A further object of this invention is to provide a rotary stencilduplicating machine which is simple, compact, and light in construction,comprising a very few number of parts; one which is convenient tooperate and produces excellent results; and one which at the same timeis sturdy and durable and clean. l

Other objec'ts of my invention willV be in part obvious and in'partpointed 'out hereinafter. r

The invention accordingly consists in the features of construction,arrangement of parts and combinations of ,elements which a will bedescribed morel fully hereinafter,

and the scope of the application of which will be indicated in theclaims thatfollow.`

Reference is now made to the drawings,

which form a art of this application, and

. of Fig. 5; Fig. 5 is a cross-sectional view,

and is taken on the line 5-5 of Fig. 3; Fig. *6 isla sectional view ofone side of the ma- I chine .minus the cylinder, roller and paper table,and is taken'on the line 6--6 of Fig.

5; Fig. 7 is an enlarged sectional view of the cylinder lock, and istaken on the line 7--7 of Fig.l 6; Fig. 8 is a sectional viewof Y theink pad and its attachment plates, the

sheet being broken. away` across the center; Fig.` 9 is a sectional viewofthe machine Vminus the cylinder, roller and paper table,

. showing the cylinder catch in normal position, and isftaken on theline 9-9 of Fig..1;

Fig. 10 is a repetition of a fragment of Fig. 9 showingi` the cylindercatch in retracted position; ig.' 11 is a topv view of the same; Fig. 12 is an enlarged top view of the cylinder minus the povenorclampf'plate, and

l Fig. 13 is an enlarged plan view, partlv.

broken away, of the paper feed table folded lintosmall. size, and the,adjacent parts o1' the machine.. Similar reference characters refer tosimilar parts`t-hroughout the several views of the drawings.

.Referring to the drawings, the machine l.has` two side plates orbrackets 20 and 21 securedtogether'by tie-rods 22, and is provided 4withfeet 23.

- these tie-rods and adjacent each Vside plate 20and 21 is a web plate24, 25.!l

An fangular plate 26 is supported' on one Vftierod-22 by means of anglebrackets 27 which are secured-to plate 26 and are pene- Itrated by therod 2% This plate 26 is also secured to the web plates 24, 25 by meansof ears28 formed on the webs and bolted to plate 26, as at 29. Plate 26has a horizontal 'flange 30 which is narrower. toward its forward edge,and ends near the engaging line of thecylinder 31 and the rubberimpression roller 32 of the machine. This to these sleeves.

Extending Vbetween f Locales flange 30 is positioned tov direct sheetsof paper into lthe desired engagement between the cylinder and roller tocause the sheet to be drawn through the machine and to be imprinted bythe'stencil sheet 33, carried by the cylinder. An angle plate 34 issecured on top of flange 30 toward each side edge thereof, andgeachplate 34 has a-downward-- ly inclining metallic guide member 35, whichmay be integral with the plate 34, and may at its end 35 be securedbetween one of the webs 24. 25 and one of the side plates 20, 21. Eachguide 35 overlies one edge of a sheet of paper fed across the flange 30,and these guides 35 aid in causingl the sheetto be properly engagedbetween the cylinder 31 and roller 32 for printing and ejection from themachine. Preferably guide members 35 are slightly lower than the top ofroller 32, where they pass by the roller adjacent its ends.

The rubber roller 32 is supported for radial movement into'a-nd out ofcontact with the cylinder 31 by being mounted on two arms 36 and37,`which at their rear ends are pivoted onjthe rear tie-bar 22, andthere confined against axial movement on this bar by being 4interposedbetween one of the angle brackets 27'and a sleeve or collar 38 whichextends to one of the web plates 24, 25. The arms may be attached Each.end of the shaft 39 of the rubber roll.32 has a ball race 40 which restsina semi-circular journal seat 41 provided therefor on the ends ofarms36 and 37. Pivoted on each arm 36,

37, at its outer end, as at 42, i's a lever 43,-

which at its upper end has a journal flange 44 movable over the ballrace 40 in the seat 41 to confine the ball races at each end of theroller shaft and to prevent displacement A rod 52,'rotatable in saidplates 20, 21 extends across the machine, and has its central i portion53 oifsetor eccentrically disposed with respect to its axis and hereengages the tops of arms 36, 37, which support the '120 roller 32.

At each s-ide of the machine there'is a coil spring 54, which at one endis secured to an ear 55 on lever 48 or 49. and which at Adjustable ends61 straddling rod 22 and clamped between the side plates 20, 21 and thewebs 24, 25 presentstop flanges 62.in the 'path of movement of tails 63of levers 48, 49, to limit movement of these levers in 011e dii'ectionto lprevent the cylinder bearings from being clamped too tightly betweenthe seats 45 and the retainers 50 and 51. By over-tight en gagenient,the bearings might be distorted. The springs 54 constantly urge arms36,l

37, and the roller 32 carried thereby to more upwardly into engz'igementwith the cylinder. lVhen levers 43 are moved to take re- "arms 36, 37.Similarly, when level-:48. 49 -are moved to place their retainingflanges 50, 51 into or ont of cooperation with seats 45, the upper endsof springs 54'move across the pivot points 64 of these levers, and thusthese springs also hold these levers 48.lv 49 resiliently in eitherposition of' adjustment.

Preferably one of the cylinder seats has Ia raised concentric rib 65,and the cylinder bearing sleeve 46 has a corresponding groove 66. Therib and-groove Aare so located in the manufacture ofthe parts that thecylinder will be in proper and accurate transversely alignment on theniachinewhen disposed thereon with the rib seated in the groove.

The cylinderstub shaft 67.which is rigidly secured to one wall of thecylinder, and which rotatably penetrates bearing sleeve 46, carries acollar or disk 68 which is notched to form a shoulder 69. A pawl 70; ispivoted to plate 20 tocooperate with this shoulder` to prevent reverserotation of der 69.

the cylinder'. 'A pin 71 on pawl 70 extends through plate 20 and-isengaged by spring 72ito resiliently hold the pawl end against collar 68.The iimer end ot' pin 71 seats iii a slot` 73 of a. link 74 which ispivoted to link56. so that when link 56 is lowered the end of 'pawl 70will be drawn and held away from collar 68, but when link 56'is inraised position the pawl is` pivotallyr movable on plate 20 toward andaway from 'this collar, and into and out of engagement with shoul- Rod52 is .provided with a handle 75 whereby this rod may be rotated 180deg-rees to move its offset portion 53 to depress the arms 36, 37, or to'allow them to rise. The.

position of handle 75 corresponding to the lowered position of rollermay be designated by the Word On marked on the web plate 24 and visiblethrough a Window 76 in plate 20, and the position of handle y 75corresponding to the raised position of' stop plates 60 having forkedroller 32 may be designated similarly by the .word Off visible throughwindow 77.

Pivoted between pins or studs 80 on walls 20 and 21 'is a cross-plate 8lhaving forwardly extending fingers 82, thefends' 'of ing direction. Aspring 86 engaging finger 84 and one stud 80 resiliently yurges thisfinger to engage in the recess 85. Also attached to plate 81 is a stopfinger 88 with which cooperates a cam-.lug 89 on an arm 90 of'a bellcrank lever pivotally mounted on plate 30. The other arm 91 ot' thislever has a handle 92 whereby the lever and its cani 89 may be adjust-edto hold fingers 82 raised above plate 30, and to hold finger' 84 awayfrom cylinder 3l. A stop lug or finger 93 on plate 81 is directed towardplate 30,` and this finger by striking plate 30 limits rearward pivotalmovement ot' plate 81, and movement of' finger 84 away from thecylinder. A cam 95 is secured to shaft 52 and coacts with a. finger 96on plate 81 in such a way that when handle 75 is infon position finger84 is free to enga-ge the cylinder to preventrotation in printingdirection, and when handle 75 is in otf7 position, finger 84 is heldaway from the cylinder, and fingers 82 -areheld above plate 30, out ofrecesses 83. Cam 95 has a shoulder 98 which strikes a-stop projection 99formed on the adjacent web plate 24.

One stub shaft 67 of the cylinder may have secured thereto a crankhandle 94, whereby the cylinder may be rotated. To the .other side ofthe cylinder there iS secured ahollow stub shaft 97, which rotates ining, a feed table construction is associated therewith. Thiscomprisestwo rectangular, flanged sheet-metal sections, 100 and- 101,each substantially the Width ot' the machine, and hinged together bysimple hinges 102. The section IOL-nearest the machine. has ears or lugs103 pivoted on pins or studs 104 carried on plates20 and 21.

The underside of section 100 has ears or lugs 105, in which is pivoted aframe 106 which' forms a support for the rear of the feed table whenextended. Frame 106 may comprise resilient wire so that it may be lockedfiat against section 100 beneath a turned-over portion 107 of lug 105,and

may be locked in projecting position between i'io 106 from .beingentirely disengaged fr om lug 105 when it isv brought around portion107.'

Section 101 has a slot 110 across the body 1 thereof, andachannel-shaped strip 111 is secured to the under-surface of section 101along this slot to provide anfundercut channel runway for two nuts 112,the strip 111 having an opening 113 which. accepts these nuts forplacement in the runway. A guide for the edge ot' a sheet of paper isassociated with each of these nuts for adjustment across the table. Eachslidable guide comprises a vertical `wall 114 having portions 115resting on the section 101 and a central portion 116 engaging in theslot 110, and a' horizontal portion 117 with a downwardly bent edge 118resting on the section 101. A set screw 119 penelrates portion 117 andengages one nut 112, whereby the guide may be clamped to section 101 inadjusted position along the slot 110.

Section 100 has a similar runway formed l by a similar channel member120 secured to section 100 beneath a similar slot 121 therein. ln thisslot is a similar nut 122.. Associated therewith is an elongated anglestrip 123, to which is attached a bracket 124 having a flange 125penetrated by a set screw 126 engaging nut 122, and whereby this bracketmay be clamped in. adjusted position along slot 121. Bracket 124 andplate 123 are pivotal about screw 126 to permit this plate to be clampedin various angular positions on the feed table. Plate 123 also hasattached thereto fingers 127, which are so positioned that they can beinterlocked beneath the horizontal portion 117 of one of the guideplates on the section 101, when the strip 123 is swung on screw 126 soas to be directed toward the cylinder. By means of strip 123 sections100 and 101 can be locked against collapsing. Strip 123 forms a.straight edge guide for one side of the sheets of paper placed on thetable 100, 101,

and fed to the 'machine Aligning marks or perforations 128 and 129 maybe applied to sections 100 and 101 to provide means for indicating anddesignating the alignment of strip 123 on the table.

Preferably section 100 is provided with a headed pin 130, which may be'engagedin a recess 131 in one end of strip 123 so that this strip maybe locked crosswise on section 100.

'When sections 100 and 101 are collapsed, they may' be swung upwardlyagainst the cylinder, as shown in Fig. 3, or they may be I placed inhorizontal positions, as'shown in Figs. 1 and .13. Section 101 isprevented from swinging lower' than horizontal position by two ears 132,which are formed on web plates 24 and 25 and are positioned to engagethe inner corners of this section. When collapsed and in horizontalposition,

as shown in Fig. 13, the free edge of section by two other ears 133'formed on webs 24 and 25 nd positioned to be beneath the free edge ofsection 100 when in this position.

lVhen collapsed and swung upwardly toward the cylinder (see Fig. 3),vthe table sections are prevented from contacting the cylinder or thestencil sheet or ink pad thereon by the guide members 114 coming againstthe rear edge of cross-plate 81. Y

Before passing to the operation of the machine, it may be well todescribe in detail thc construction of the cylinder, although theforegoing mechanism is independent 0f the specific cylinder constructionillustrated. As shown, the cylinder includes two opposite sido walls 150and 151, having peripheral flanges 152 and 153. A sealed ink compartmentis formed within the cylinder, the compartment having side walls 154 and155, flanged at 156 and 157. and secured to flanges 152 and 153 ofcylinder walls 150 and 151. Extending between walls' 150 and 151,v andembracing a major part of the circumference of the cylinder, is aperforated diaphragm 158, which has its side edges tightly securedbetween the flanges 152 and 156 on one side and between the flanges 153and 157 on the other side. These seams or joints are leakproof.Embracing the remaindery of the circumference of the cylinder is a plate160, the body of which is depressed below the surface of the cylinder.This lplate has raised side flanges 161 and 162, flange 161 beingsecured to flange 156 of wall 154, and flange 162 being secured toflange ,157 of wall 155, the joints being leak-proof. The ends 163 ofplate 160 are curved upwardly against the lower surface of the adjacentedge portionof the diaphragm and are secured thereto along a leak proofjoint. The ends of plate163 and diaphragm 158 establish beveled surfacesor seats 164.

RigidlyA suspended from a shaft 165 journaled in bearings 16'6 and 167secured to walls 154 and 155 is an ink trough 168. At' one end shaft 165extends outside of the machine, as at 169, so as to be accessible to theoperator to tilt. the trough and spill ink into the compartment toreplenish the ink right when the ink trough 168 is in untilted position,and when in this position lug 174 is disposed in a slot 176 formed inplate 21,'.

so that the shaft 165 cannot be rocked nor the ink trough 168 tilted tospill ink unless this lug 174 be withdrawn from this slot. In thismanner .accidental spilling of ink from trough 168 is prevented, but theoperator may conveniently spill the ink when he so desires. Whenreleased, the ink trough .swings into untilted position and lug 174automatically locks in recess 176'. The lever v172 not only serves as alatch in the manner Behind the diaphragm 158 is a grille orgridstructure 180 whicliaids in spreading over the diaphragm the ink spilledfrom trough 168. I.

The diaphragm 158 is covered by an ink pad, and' the stencil sheet 33 islaid on this pad. T he ink pad comprises a sheet of snitable. fabric 182to each end of which is secured a strip of metal 183, by folding eachstrip 183 upon itself with an edge of the fabric within the told, andthen folding the doubled portion over again in suoli a wa that the roundedge 184 of the fold will be in advance of' the extreme edge 185 of themetal. In this way the fabric will bear against the round end 184 of the'fold and will not be cut by the extreme edge 185 of the plate. whichedge might be sharp and jagged. Preferably the other edge of each metalstrip is folded on itself, as at 186. The ink pad is secured to thecylinder by e11- gaging the inner edge of the plates 183 within thegrooves 187 formed by the lient edges 163 of the plate 160, or beneath arod 188 positioned in one of these grooves, (see Fig. 3), and movingslidable latches 189 over the opposite edges of plates 183. These latchplates 189 are sldably retained under straps 190 secured on the top ofplate 16'0. Pref-V erably the plates 183` are both alike so that the inkpad may be reversed, or turned over on the cylinder. By changing the padaround froin'time to time its life may be extended.

Also on plate 160, near the leading edge of the diaphragm, are securedhooks. 191,

i with which the stub 192 of stencil sheet 33 may be engaged by placingthe holes 193 in the stencil stub over the hooks. Both the ink pad andthe vstencil sheet lie across the beveled seats 164.

The ink pad and the stencil sheet are firmly clamped against these seatsby a'metal frame having edges 194 of coinplementiiry bevel to the seats164 and arranged to align therewith. vThe frame comprises an outer plate195 conforming to the outer periphery This lever also serves as an in'of the cylinder, and an inner plate 196, `secured together, plate-196having a'perforation 197 to avoid interference from filler cap 178.Towardeach side edge, plate 195 is foi-ined with a depressed portion 198and with a raised flange, vwhich-is curved at cach end, as at 199, andhas a straight portion 200 intermediate these curved portions. On theunderside of each straight portion 2U() is a metal strip 201 which has apin 202 extending through a -slot 203 in flange 200 andthere headedovei'. Toward .its other end strip 201 carries a threaded pin 204 whichpenetrates a slot in flange 200 and is there engaged by a nut 205,whereby the strip may be pivotally moved on its pin 202 toward and fromflange 200. A spring 206 compressed between flange 200 and strip 201urges the strip to move away from flange 200. The edges of the cylinderare formed with curved portions 207 corresponding with flange portions199, and with a straight portion 208 which seats beneath that part offlange portion 200 which is not occupied by strip 201, and with a lowerstraight portion 209 which extends between the curved portions 207, butis spaced from portion 208 to leave'aI recess therebetween. The framemay be secured on the cylinder by loosening y screws to lower strips 201from flanges 200,

and then after placing the frame upon the cylinder, sliding the stripson flanges 200 to place the ends of the strips in the recess betweencylinder flanges 208 and 209. At the same time perforations 210 inflanges 200 are 'engaged over pins 211 on cylinder flange portions 208.Now, by tightening nut 205 the strips 201 will be brought firmly againstportions 208 and the frame will be clamped tightly downwardly, thusclamping the beveled edges 194 tightly toward the beveled edges 164 andclamping the ink pad and stencil sheet tightlytherebetween. -To removethis frame, it is only necessary to gra-sp nuts 205, loosenthem, slidethem, with the attached strips 201 on flanges 200 to disengage thestrips from beneath portions 208, and then lift the frame upwardly. Theremoval leaves the stencil sheet and pad readily accessible for removalor replacement, as before described.

.Preferably a lock is provided for frictionally holding the cylinderagainst rotation. This may comprise a case 220 on the inner side of wall20, a plunger 221 in the case pressed inwardly by spring 222, and an arm223 carried on the plunger and having a rubber or leather head'224movable against the side 150 of the cylinder. Case 220 has on one wall abayonet slot 225 through which rod 223 extends and whereby this rod maybe locked with its head w1thdrawn from the cylinder.

When it is desired to put the machine to use, the table is lowered and,Ais fully extended (see Fig. 1) when it is desired to print large sheets,or is only partially extended (see F ig. 13) when it is desired to printpost cards or smaller sized sheets. The paper guide'members are thenadjusted on the table to direct the sheets in proper alignment into themachine. The manner of carrying out Vthe above adjustments has 'tents 70and 84, the cylinder cannot be turned in either direction, nor can theinked stencil'sheet contact the roller 32. A sheet is no w fed manuallyalong the feed table and plate into the machine while the cylinder 68 isheld tightly'againstdetent 70, as by applying reverse pressure to handle94. The forward part of the sheet will be disposed between the linger 82and the apertures 83 in plate 30. The handle 94 is now turned inprinting direction, and by reason of the sheet holding the fingers 82from lowering into apertures 83, the detent 84 will be held away'fromthe cylindei` and the cylinder may be turned to draw the stencil sheetthrough the machine and to be impressed by the stencil sheet. After thepaper leaves the machine the detent 84 will prevent a seeond rotation ofthe cylinder, unless another sheet of paper is fed into the machine.

vFeeding each sheet to the machine while the disk 68 is drawn againstdetent 70, the upper margin on each sheet can be made uniform, and thetop of the printing will fall at a predetermined place on each sheet.

If it should be desired to rotate the cylinder in the absence of sheetsto be printed, it is merelynecessary to turn the roller handle 75 to offposition. Thisholds detent 84 retracted from the cylinder and at thesame time holds roller 32 away from the cylinder so that itwill not bedamaged or dirtied by ink therefrom. At the same time detent 70 is heldaway from collar 68. This freeing of the cylinder for rotation in theabsence of paper to lbe printed is desirable at times when it is desiredto replenish the stencil with ink.

A If for any reason it is desired to allow the cylinder to rotate withthe roller contacting t e same, then detent 84 may be locked inretracted position by means of lever handle 92.

The cylinder may at any time be` frictionally locked against rotation bymeans of the lock which is in casing 220 and is operable by handle 223.

The ink trough becomes locked automatically against tiltingby theautomatic seatino of the lug 174 in recess 17 6'."v

'o remove the entire cylinder-,it is only necessary to withdrawretaining hooks `5() and 51, and the cylinder is free-to be liftedfrom-its 'supporting structureji' f To remove the rubber roller 32,itlisonly necessary to Withdraw rthe retafiiri'tigfhooks 44, and theroller is free yto'be'littedfrom the machine. 1 f When the cylinder isreplaced.' theV engagement of groove 66 over rib 65 on the supporteffects accurate placement of the cylinderl and eliminates any necessityfor making other transverse adiustn'lent thereof. The cylinder isrotatably locked in position on ils support by bringing` the retainers50 and 51 over the cylinder bearing sleeves.

When the roller 32 is replaced, it automatically assumes proper positionin its curved seats and betweenl the side Walls thereof. The roller isrotatably locked in position on the supporting arms 36 and 37 bybringingthe retainers 44 over the ball races 40. l s It will be noted that thesprings 54 serve three separate functions. press the roller against thestencil sheet so that the paper therebetween will be properly imprinted.These springs also hold the roller retainers 44 in either position ofad- 'r justment. These springs also hold the c vlinder retaining levers'p48 and 49 in both positions of adjustment. Y

W'hen the machine is to be stored or transported, the table can becollapsed against the cylinder. As will be readily apparent, the machineis exceedingly simple. comprising a very few number of parts. Each partis readily accessible for repair or replacement. At'the same time, theoperator is not y required to make fine adjustments when replacing thecylinder or roller. nor to exercisel extreme care during` operation.

As many changes could be made in the above construction and as manyapparently widely different embodiments of this invention could be madeWithout departing from the scope thereof. it is intended that all mattercontained in the above description or shown in the accompanying drawingsshall 'be interpreted as illustrative and notin a i 'l hese sp1 ings llEscribed, in combination, a rotatable printing cylinder, a releasabledetent for the cylinder, positively preventing rotation of the cylinderin one direction' until the detent is released, another releasabledetent for the cylinder, positively preventing rotation of the cylinderin the opposite direction until this detent is released, and means forlocking both of said detents out otl engagement with the cylinder tofree the cylinder for repeated rotation in both directions.

3. In an apparatus of the character described, in combination, arotatable printing cylinder, a rubber roller adjustable into and out ofcontact with thel cylinder, adjustable detent means engaging thecylinder and posn itively preventing rotation thereof in bothdirections, and means for simultaneously locking said roller out ofcontact With said cylinder and maintaining said detent means ont ofengagement with said cylinder, to free the cylinder for repeatedrotation in `both directions out ot contact with saidroller.

4. In an apparatusof the character described, in combination, arotatable printing cylinder positioned to operate on sheets of paper fedthereto along a predetermined path, a detent engageable with thecylinder at a predetermined place governing the amount said cylinder mayrotate in printing direction, and means-actuated by a sheet ot' paper ona certain portion of said path to disengage .said detent temporarilyfrom said cylinder to permit revolution ot' said cylinder in printingdirection.

5. In an apparatus ot' the character described, in combination, arotatable printing cylinderpositioned to operate on sheets of paper fedthereto along a predetermined path, a detent engageable with thecylinder at a predetermined place governing the amount said cylinder mayrotate in printing direction, means actuated by a sheet of papel' on acertainportion'of said path to disengage said detent temporarily fromsaid cylinder to permit revolution of said cylinder Y1n printingdirection, and means operative in y the absence of a sheet of paper onsaid portion of said'path to cause said detent to engage with saidcylinder to prevent more than one complete revolution thereof inprinting direction after' release by the temporary disengagement of thedetent.

6. In an apparatus of the character described, in combination, arotatable printing cylinder, and means limiting rotation of saidcylinder in one direction, said means including a pivoted ngerengageable ina notch in said cylinder, a spring pressing'said fingerinto engagelnent in said notch, and adjustable means for locking saidfinger out of engagement with said cylinder against the action of saidspring. l l

7. In an apparatus of the character described, in combination, arotatable printlng cylinder,

cylinder, and means limiting rotation of said cylinder 'n one direction,said means including a pioted finger engageable in a notch in saidcylinder, and a spring pressing said tinger into engagement in saidnotch, said tinger having an extension, and means including a movablelever coacting with said ex-V tension, whereby said finger may be heldout of engagement with said cylinder against the action of said spring.

8. In an apparatus of the character described, in combination, arotatable printing and means limiting rotation ot' said cylinder in .onedirection, said means including a pivoted finger engageable in a notchin said cylinder, a spring pressing said linger into engagement in saidnotch, and adjustable meansI for locking said finger out of engagementwith said cylinder against the action of said spring, said meansincluding an arm connected with said finger, a rotatable cam engagingsaid arm, and a handle for rotating said cam. l

5). In an apparatus of the character described, in combination, arotatable printing cylinder, andmeans limiting rotation ot said cylinderin one direction, said means including a disk rotatable with thecylinder and -having a. shoulder, and a pivoted pawl coacting with theshoulder on said disk.

l0. ln an apparatus of the character described, in combination, arotatable printing cylinder, and means limiting rotation of saidcylinder in one direction, said means including a disk rotatable withthe cylinder and having a shoulder, a pivoted pawl coactingwith theshoulder on said disk, and spring means pressing said pawl intoengagement with said shoulder.

.11. In an apparatus of the character described, in combination, arotatable printing cylinder, and means limiting rotation of saidcylinder in one direction, said means including a disk rotatable withthe cylinder and having a shoulder, a pivoted pawl coacting with theshoulder on said disk, spring means pressing said pawl into` engagementwith said shoulder, and adjustable means engaging said pawl forholdingsaid pawl out of engagement with said shoulder against the actionof said spring.

12. In an apparatus ot the character de'- scribed, in combination, arotatable printing cylinder, and means limiting rotation of saidcylinder in onedirection, saidmeans includinga disk rotatable with thecylinder and having a shoulder, a pivoted pawl coacting with theshoulder on said disk, spring means pressing said pawl into engagementwith said shoulder, and adjustable means engaging said pawl for holdingsaid pawl out of engagement with said shoulder against the action ofsaid spring, said adjustable mean-s` including a pivoted arm connectedwith said pawl, a rotatable-cam shaft coacting with lou Hifi

liti

said arm, anda handle for rotating said cam shaft.

13. In an apparatus of the character described, inl combination, arotatable printing cylinder, a. paper feed plate adjacent the cylinderand having apertures, a. pivoted late over said feed'plate and havingfeeler ngers movable with said plate into and out of said apertures, adetent attached to saidI plate and movable therewith into and out ofengagement with said cylinder, to limit rotation of said cylinder whensaid lingers enter said apertures and to permit rotation of saidcylinder when said lingers are withdrawn from said apertures. i

` 14. In an apparatus of'the character described, in combination, arotatable printing cylinder., a paper feed platel adjacentl the cylinderand having apertures, a pivoted plate over said feed plate a-nd havingfeeler yfingers movable with said plate intoa'nd out of said apertures,Ia detent ,attached to said- 'oted arms supporting said roller, arotatable shaft'having an offset portion engaging said arms from above,spring means pressing said arms u Wai-'ily against said shaft, and ahandle or rotating said shaft to rotate said offset portion to causesaid arms and the roller carried thereon to raise and lower.

16. In an apparatus of the character described, in combination, a rubberroller, pivoted arms supporting said roller, a rotatable shaft having anoffsetportionengaging said arms yfrom above, spring means pressing saidarms upwardly against said shaft, a rotatable printing cylinder, apivoted detent lengageable with saidcylinder to limit rotation thereof,an arm connected with said detent for movement therewith, a. cam on saidshaft coacting with said arm, and a handle for rotating said shaft torotate said offset portion to cause said arms and the roller carriedthereon to raise and lower, and to rotate said cam to permit and toprevent said. detent from engaging said cylinder.

17. In an apparatus of the character .de-

scribed, in combination, a rubber roller, pivoted. arms supporting saidroller, a rotatable shaft having an otfset portion engaging said armsfromA above, spring means pressing said arms upwardly against saidshaft, a rotatable printing cylinder, a pivoted detent engageable withsaid cylinder to limit rotation thereof in one .(lirettioii, an armconnected with said detent for movement therewith, a cam on said shaftcoacting with said arm, another detent engageable with said cylinder tolimit rotation thereof in the opposite direction, a link connecting thisdetent with one of said roller supporting arms for movement therewith,and a handle for rotating said shaft to rotate said offset portion tocause said arms and the roller carried thereon and said link to raiseand lower, and to rotate said cam to permit and to prevent said detentfrom engaging said cylinder, whereby said cylinder is freed'for repeatedrevolution in both directions while said rollei' is held out of tontacttherewith, and is held by said detents against rotation in eitherdirection while said roller contacts said cylinder.

18. In an apparatus of the character described` in combination, a rubberroller, pivoted arms supporting said roller, a rotatable shaft having anoffset portion engaging said arms from above, spring means pressing saidarms upwardly against said shaft, a. rotatable printing cylinder, apivoted detent engageable with said cylinder to limit rotation thereofinone direction, an arm connected with said detent for movement therewith,a cam on said shaft coaeting with said arm, another detent engageablewith said cylinder to limit rotation thereof in the opposite direction,a link connecting this detent with one of saidroller supporting arms formovement therewith, and a handle for rotating said-shaft to rotate saidoffset portion to cause said arms and the roller carried thereon andsaid link to raise and lower, and to rotate said cam to permit and toprevent said detent from engaging said cylinder, whereby said cylinderis freed for repeated revolution in both directions while said roller isheld out of contact therewith, and is held by said detents againstrotation inrither direction while said roller contacts said cylinder,and means actuated by va sheet of paper fed to the machine for releasingthe cylinder for rotation in printing direction while said rollercontacts the cylinder.

` This specification signed this 5th day of i October, 1925.

ERNEST J. BRAssEUR.

